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R. S. WILLIAMS.

PROCESS OF WRINKLING GOLD DENTAL FOIL.

(No Model.)

No. 298,716. Patented May 13, 1884.

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PATENT Dismiss...

RICHARD S. VILLIAMS, OF NEV YORK, N. Y.

PROCESS'OF WRENKLING GOLD DENTAL FOH...

SZPECIPICATION forming part of Letters Patent No. 298,716, dated May 13, 1884:.

Application filed September 17. 1853. (No model.)

To ctZZ whom it may concern:

Be it known that I, RICHARD S. WrLLiAMs, of the city, county, and State of New York, have invented a new and useful Improvement in the Process of Gorrugating or lVrinkling the Surface of Dental Foil; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying sheet of drawings, forming part of this specification.

This invention is in the nature of an improvement in the process of corrugating or wrinkling the surface of dental foil; and the invention consists in the process hereinafter shown, described, and claimed, together with the corrugated foil as a product of said process.

In the accompanying sheet of drawings, Figure 1 is a side elevation of the device; Fig. 2, a plan of plain foil; Fig. 8, a plan of wrinkled foil.

Similar letters of reference indicate like parts in the several figures.

It is well known that foil for dentists use is frequently prepared with a fine wrinkled surface, technically called corrugated gold. Foil of this description is preferred by many dentists, and is believed to possess several advantages not found in foil with plain surfaces.

The process commonly employed of wrinkling the foil, and heretofore patented, consists, mainly, in placing the plain foil between sheets of paper, subjecting them to heat and pressure until the paper is charred, when the paper, shrinking into fine wrinkles, causes the foil to wrinkle in a corresponding manner. This process, however effective it may be in imparting the required wrinkled surface to the foil, possesses this disadvantage: The charring of the paper necessarily causes more or less smoke to be evolved, which deposits a film of unconsumed carbon on the surface of the foil. This film, although practically imperceptible to the eye, makes its presence known by preventing a close metallic contact between the surfaces of the gold, under the action of the dentists plugger, after it has been annealed. In other words, it robs the gold to some extent of that well-known sticky property that renders it so valuable for dental purposes. To overcome this objection, as well as to wrinkle or corrugate the foil by a much quicker and easier process than that just described, I employ the following apparatus and process: Se-

cured to any suitable foundation are a series of metal fingers, A, bent to represent as nearly as may be the bent fingers of the upturned hand, or cup-shaped. Into the grasp of these fingers a slightly-moistened sponge, B, is placed, of such size as ,will enable it to be slightly grasped by the metal fingers referred to. Upon the upper surface of this sponge B is placed a sheet of plain foil, a. A second moistened sponge, O, is next laid on the foil a, the sponge O by the hand of the operator is by a slight pressure forced downward upon the foil, and at the same time to a small extent compressed by the fingers of the hand, and the result is the foil between the sponges is compelled to follow the wrinkled surfaces of the two sponges between which it is placed, and it is in turn wrinkled to correspond, and bears upon its surface a permanent wrinkling not unlike that which is shown in Fig. 3. It is obvious that the foil in this way prepared is left after the wrinkling in its original purity, for it comes in contact only with the clean sponges. Any moisture that may be left on its surface quickly evaporates, leaving no deposit, or even stain, to mar thev metal. The function of the moisture in the sponges is simply to prevent the foil from adhering to them and to render them more elastic.

Another advantage derived from this process of wrinkling or corrugating gold-foil over that which has been heretofore employed is that in the former processes, by the application of heat, the foil was necessarily annealed, so that when the foil was rolled or folded up into pellets, cylinders, and the numerous other forms employed by dentists and dental-supply men the surfaces of the foil would adhere under some circumstances, whenever in contact, rendering the gold to some extent less desirable than would be the case if this feature did not obtain. By my process, no heat being employed, the foil will not adhere when made up in the manner mentioned; but when annealed after it has been formed up it will be far more ductile and readily manipulated, for the reason that the several folds remain separate until worked, and are therefore more easily forced into the desired dental cavities. Besides, it is sometimes an advantage to be able to make up cylinders, pellets, &c., of corrugated or wrinkled foil not annealed, because they can be used in that condition, and when freshly annealed after being made up, and just as needed for use, they possess a cohesive and uniform quality which cannot be so fully obtained in any other way, or by reannealing.

There are other advantages derived from my process of wrinkling the surface of dental foil not necessary to mention in this specification.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The process of making wrinkled dental foil, the same consisting in placing the foil bined with sponges confined therein and compressed laterally by the said arms as the sponges are pressed down into or between said arms, substantially as described, and for the purpose specified.

RICHARD S. VILLIAMS.

Witnesses:

JULIAN McV. ANDERSON, G. M. PLYMPTON. 

